| /* |
| * Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file |
| * for details. All rights reserved. Use of this source code is governed by a |
| * BSD-style license that can be found in the LICENSE file. |
| */ |
| /** |
| * @assertion Future<T> singleWhere(bool test(T element)) |
| * Finds the single element in this stream matching test. |
| * Like lastMatch, except that it is an error if more than one matching element occurs in the stream. |
| * @description Checks that the single element is returned. |
| * @author kaigorodov |
| */ |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| import "IsolateStream.dart" as IsolateStream; |
| |
| void check(Iterable data, bool test(var element), var expected) { |
| Stream s = IsolateStream.fromIterable(data); |
| asyncStart(); |
| Future f = s.singleWhere(test); |
| f.then((var actual){ |
| Expect.equals(expected, actual); |
| asyncEnd(); |
| }); |
| } |
| |
| main() { |
| check([1, 2, 3, null], (var element) => element == null, null); |
| check([1, 2, 3], (var element) => element > 2, 3); |
| check(new Iterable.generate(10, (int index) => index * 5), (var element) => element == 30, 30); |
| } |